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H2 as a Possible Carrier of the DIBs?

Published online by Cambridge University Press:  21 February 2014

W. Ubachs
W. Ubachs*
Affiliation:
Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, the Netherlands email: w.m.g.ubachs@vu.nl
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Abstract

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In the 1990s the hydrogen molecule, by far the most abundant molecular species in the interstellar medium, has been proposed as a possible carrier of the diffuse interstellar bands. While some remarkable coincidences were found in the rich spectrum of inter-Rydberg transitions of this molecule with DIB-features, both in frequency position as in linewidth, some open issues remained on a required non-linear optical pumping scheme that should explain the population of certain intermediate levels and act as a selection mechanism. Recently a similar scheme has been proposed relating the occurrence of the UV-bump (the ubiquitous 2170 Å extinction feature) to the spectrum of H2, therewith reviving the H2 hypothesis.

Keywords

ISM: moleculesextinctionH2radiation mechanisms: nonthermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 375 - 377
Copyright
Copyright © International Astronomical Union 2014 

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